D75 vs D80
D80 is 1.1 times as stiff as D75. Their densities are about the same. Per unit mass they are about equally stiff (21.57 and 22.22 MJ/kg). Strength: f_m,k = 75 MPa for D75, f_m,k = 80 MPa for D80.
Side by side
ratio = D80 / D75 · log scale| Property | D75 | D80 | Unit | Ratio | ¼×1×4× |
|---|---|---|---|---|---|
| E₁ Modulus, direction 1 | 22 | 24 | GPa | 1.09× | |
| E₂ Modulus, direction 2 | 1.47 | 1.6 | GPa | 1.09× | |
| E₃ Modulus, direction 3 | 1.47 | 1.6 | GPa | 1.09× | |
| G₁₂ Shear modulus 1-2 | 1.38 | 1.5 | GPa | 1.09× | |
| G₁₃ Shear modulus 1-3 | 1.38 | 1.5 | GPa | 1.09× | |
| E₀,₀₅ Modulus parallel to grain, 5 % fractile | 18.5 | 20.2 | GPa | 1.09× | |
| ρ Density | 1020 | 1080 | kg/m³ | 1.06× | |
| ρ_k Density, characteristic (5 % fractile) | 850 | 900 | kg/m³ | 1.06× | |
| f_m,k Bending strength | 75 | 80 | MPa | 1.07× | |
| f_t,0,k Tension parallel to grain | 45 | 48 | MPa | 1.07× | |
| f_t,90,k Tension perpendicular to grain | 0.6 | 0.6 | MPa | 1× | |
| f_c,0,k Compression parallel to grain | 37 | 38 | MPa | 1.03× | |
| f_c,90,k Compression perpendicular to grain | 12.8 | 13.5 | MPa | 1.05× | |
| f_v,k Shear strength | 5 | 5 | MPa | 1× | |
| E/ρ Specific stiffness E/ρ · derived | 21.57 | 22.22 | MJ/kg | 1.03× | |
| c₀ Bar wave speed √(E/ρ) · derived | 4644 | 4714 | m/s | 1.02× | |
| f/ρ Specific strength f/ρ · derived | 73.53 | 74.07 | kJ/kg | 1.01× |
Values at the first thickness band or product form of each material (EN 338:2016; EN 338:2016). A minimum and a characteristic value are not the same kind of number — read the ratio as a guide. Each material's page lists every band and every source.